<nav class="navbar navbar-inverse navbar-fixed-top">
  <div class="container">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">在线竞拍</a>
    </div>
    <div class="collapse navbar-collapse navbar-exl-collapse">
      <ul class="nav navbar-nav">
        <li>
          <a href="#">关于我们</a>
        </li>
        <li>
          <a href="#">联系我们</a>
        </li>
        <li>
          <a href="#">网站地图</a>
        </li>
      </ul>
    </div>
  </div>
</nav>